• Darwin Archive | Manuscript pages and draft sections from 'Origin of species', 'Descent of man' and 'Power of movement', 1858 - 1880 | ['Descent'] "Ch I" p 21, 1870-01-01 - 1882-04-30
• Darwin Archive | Manuscript pages and draft sections from 'Origin of species', 'Descent of man' and 'Power of movement', 1858 - 1880 | "The muleteers in S. America" for ['Descent'] "Ch I" p 21, 1870-01-01 - 1882-04-30

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